Bearing for electrical measuring instruments.



PATENTED JUNE 26, 1906.-

W. E. MCCOY. BEARING FOR ELECTRICAL MEASURING INSTRUMENTS.

APPLICATION FILED APR.1B, 1903.

mvswron m6.- Way A TTIORNEY.

UNITED STATES PATENT oFrioE.

WALTER EHMSEN HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OFPENNSYLVANIA.

MCCOY, NEW YORK, N. Y., ASSIGNOR TO WESTING- BEARING FOR ELECTRICALMEASURING INSTRUMENTS- Specification of Letters Patent.

Patented J une 26, 1906.

Application filed April 18,1903. Serial No. 153,340.

the integrating or registering type; and it has for its object toprovide effective and durable bearings for the spindles of the rotatingmembers of such instruments. view I have devised the means shown in theaccompanying drawing, the single figure of which is a vertical sectionof my improved bearing and a ortion of the supporting framework thereor.

Satisfactory operation of integrating or registering measuringinstruments demands the elimination, so far as maybe possible, offriction in order that the wear upon the bearings may be reduced to aminimum and also to insure the accurate operation of the instrumentunderlight loads. It has been a usual practice in instruments of thischaracter to provide a concave j ewel-step for the lower end of thespindle, and if the form of the ste and the end of the spindle engagingtherewit are properly designed reasonably satisfactory operation isobtained; but even under such conditions the wear is of thatreadjustment of the bearings and new jewels are necessary from time totime in order to preserve satisfactory operation.

My invention is designed to insure satisfacszory operation for asubstantially unlim- 1te fulfil the requirements.

Since the operating parts of the meter do not ertain to my invention, Ihave shown mere y those parts which directly cooperate, these being asuitable base-piece 1 and an adjustable screw-stud 2, mounted in saidbase and having a block-jewel 3 set into its upper end. The outer faceof the jewel 3 has a shallow concave recess or seat 4, on which rests apolished steel ball 5, and on this ball rests a similar jewel 6, havinga concave seat or recess 7., the jewel being set into the lower end suchproportions With this end in of the spindle 8. The bearing comprisingthe parts just described is inclosed within a tubuar casing 9 in orderto afiord suitable protection for the relatively moving parts. Theradius of curvature of the recesses 4 and 7 is greater than that of theball 5, so that the contact surfaces between the ball and the jewels areextremely small, whereby friction in the bearing is rendered almost inapre-' ciable. The relative speed of the frictionsurfaces is reduced toone-half of that of the ordinary step-bearing, and since the ballrotates at one-half the speed of the shaft it is subject to much lesswear than would otherwise be the case. Furthermore, whatever Wear takesplace is evenl distributed over the entire surface of the balVibrationcauses merely a rolling motion of the ball instead of a rubbingaction, and the arrangement of the parts is such that there is littledanger of nury. Even if one of the jewels becomes njured to such anextent as to prevent rotatlve movement between itself and the ball theshaft-bearing is still as good as the ordinary ste -bearing claim as myinvention-- I 1. A bearing for electrical measuring mstrumentscomprising two jewels each of which has a concave bearing-surface ofsingle, uniformcurvature andan interposed polished steel ball.

2. A hearing for an electrical measuring instrument shaft or spindlecomprising two jewels having opposing concave bearing-surfaces of sinle, uniform curvature and an interposed polished steel ball the radiusof ourvature of which is less than that of said bearing-surfaces. periodand has been found in practice to i 3. A bearing for an electricalmeasuring instrument shaft or spindle comprising an adjustable studprovided with a jewel having a concave bearin -surface of single,uniform curvature, a j ewe mounted in the end of the shaft or spindleand having a concave bearing-surface of single, uniform curvature and apolished steel ball interposed between said bearin ature t at is lessthan that of said surfaces.

4. The combination with a rotatable shaft or spindle provided with ajewel having a concave bearing-surface of single, uniform -surfaces andhaving a radius of curv IOO curvature, of an adziust'able stud providedscribed my name this 11th day of Aprilr with a jewel having a concavebearing-sur- 1903. face of single, uniform curvature and a ball WALTEREHMSEN MCCOY 4 interposed between said bearin surfaces the L 5 radius ofcurvature of which is iss than that. Witnesses:

of said bearing-surfaces. CLARENCE TERRY, In testimony whereof I havehereunto sub- WM. H. OAPEL.

